Fabrik-deutz



(No Model.)

N. A. OTTO.

GAS 0R OIL MOTOR ENGINE.

No. 433,811. Patented Aug. 5, 1890.

' UNITED STATES PATENT OFFIC NIOOLAUS AUGUST OTTO, -OF COLOGNE, ASSIGNOR TO THE GAS-MOTOREN- FABRIK-DEUTZ, OF KOLN-DEUTZ, GERMANY.

GAS OR OIL MOTOR ENGINE.

SPECIFICATION forming part of Letters Patent No. 433,811, dated August 5, 1890.

Application filed April 21, 1890. Serial No. 348,896. (No model.) Patented in Belgium April 5, 1890, No. 90,095, and in Italy April 29, 1890,-LIII, 332.

To all whom it may concern:

Be itknown that I, NICOLAUS AUGUST Orro, a citizen of Prussia, residing at Cologne, in the German Empire, have invented new and useful Improvements in Gas or Oil Motor Engines, (for which I have obtained Letters Patent in Belgium, dated April 5, 1890, No. 90,095, and in Italy, dated April 29, 1890, Vol. LIII, 332,) of which the following is a specification. This invention relates togas and oil motor engines working with a cycle of four strokes, and has for its object to provide novel and simple means for operating the dischargevalve without the employment of a countershaft driven through toothed gearing from the engine-shaft at half the speed of the latter.

If the movement of the discharge-valve of the cylinder were effected by the engine-shaft or by a counter-shaft revolving at the same speed without special appliances, the discharge-valve would be opened both during the discharging-stroke and during the compressing-stroke.

In order to maintain the discharge-valve 2 5 closed during the compressing-stroke, according to the present invention, a suitable apparatus is made to act upon the dischargevalve gear at the proper time by the action of the pressure produced during the compres- 0 sion or working strokes.

Figure 1 of the accompanying drawings shows a longitudinal section of a gas-motor engine with apparatus for operating according to my said invention applied thereto.

Fig. 2 shows a diagram of the crank-motion, and Fig. 3 shows a different position of the operative parts.

The crank-shaft of the engine has an eccentric u, or a crank which is placed at an 40 angle of ninety degrees to the engine-crank, as at Fig. 2, and from which by means of a rod 1) an igniting-slide z is actuated. The igniting device is here assumed to be aheated tube; but any other known igniting device may be used. A double-ended lever cl is connected atits one end by a link 0 to the slide 2, so as to have a to-and-fro motion imparted to it thereby, and to the other end of the lever is pivoted a rod or pawl 6. According to the gine-cylinder by a small passage.

position given to this red it will either be made to force open the discharge-valve f by bearing against the notched end of its stem during the forward motion of that end of the lever cl, or it will miss the end of the valvestem when brought into the position shown at Fig. 3, and will thus allow the valve to remain closed. In order to cause such shifting of the rod to take place in such a manner that the discharge-valve is opened during the discharge-instroke of the piston, but remains closed during the oompressing-instroke, I employ the following arrangement: The rod 6 is acted upon by a spring m, which always tends to draw it out of gear with the valve-stem, so that on the forward motion of thelever d. the valve is not opened thereby. To the rod eis connected a piston n, the outer end of which is coned as a valve, so as to fit on a seating formed in the small cylinder in which it works. Between the rod 6 and piston n is provided a spring 0, and the space in the cylinder behind the piston 02 communicates with the en- During the compression-stroke the pressure forces the piston n outward against its seat, thereby causing the spring 0 to be compressed. The rod connected therewith, however, cannot put the rod e in gear with the stem of valve f, as by the motion of the lever d the rod 6 will have been moved past the stem. The ensuing pressure due to the explosionwill keep the piston '11 in the same position, so that when on the backward motion of the lever 01 the end of the rod c has passed the end of the valvestem, the spring 0 will move back the rod 6 in line with the stem, as at Fig. 1, so that when during the expelling-stroke the igniting-slide moves to the left, thereby moving forward the outer end of leverd, the rod 6 will force open the discharge-valve. At the following charging-stroke the decrease of pressure in the cylinder will allow the piston n to be forced away from its valve-seat by the atmospheric pressure and by that of the spring q, whereupon the rod 6 will be drawn out of gear with the valve-stem by the spring 0%.

Instead of the small cylinder with piston 01 may be employed any other apparatus that is moved in a similar manner to that above described by the pressure in the engine-cylinderas, for example, the apparatus with flexible diaphragm described in my application bearing equal date herewith.

I do not herein claim utilizing the variations of pressure produced either in the gas and air supply pipes or in the engine-cylinder during the several strokes of the piston for acting upon mechanism connected with the discharge-valve in such manner that this valve is caused to remain closed during the compressing-instroke and to be opened during the eXpelling-instroke, as such method constitutes the subject-matter of my application filed April 21, 1890, Serial No. 348,894. Nor do I claim, specifically, the combination, with the discharge-valve, of a locking-lever receiving reciprocating motion from a crank or eccentric on the engine-shaft, a pivoted rod on such lever acted upon by a spring tending to keep the rod in line with the discharge-valve stem, so as to force this valve open during the compressing-stroke of the piston, and a cup and diaphragm or equivalent device subject to the variations of pressure in the gas or air supply pipes, such dia phragm or equivalent device being connected with the pivoted rod on the rocking lever, so that when the diaphragm is subject to a pressure below that of the atmosphere during the suction-stroke of the piston it acts on .the pivoted rod, so as to prevent it from opening the discharge-valve, as such constitutes the subject-matter of my application filed April 21, 1890,'Serial No. 348,895.

Having thus described the nature of my invention and the best means I know for carrying the same into practical effect, I claim 1. In a four-stroke-cycle gas or oil motor engine, the combination, with the dischargevalve of the engine, of a rocking lever receiving reciprocating motion from a crank or eccentric on the engine-shaft, a pivoted rod on such lever acted upon bya spring tending to keep the rod out of line with the dischargevalve stem, and a small cylinder and piston or equivalent device subject to the variations of pressure in the engine-cylinder, such piston or equivalent device being connected with the pivoted rod on the rocking lever, so that when the small piston is subject to the pressure in the engine-cylinder during the compressing or working stroke of the engine-piston it acts on the pivoted rod, so as to bring it in line with the discharge-valve stem and cause it to open the valve during the expelling-stroke of the piston, substantially as herein described.

2. In a four-stroke-cycle gas or oil motor engine, the combination, with the dischargevalve of the engine, of a rocking lever receiving reciprocating motion from a crank or eccentric on the engine-shaft, a pivoted rod on such lever acted upon by a spring tending to keep the rod out of line with the dischargevalve stem, a small cylinder and piston or equivalent device subject to the variations of pressure in the engine-cylinder, an elastic connection between the small piston and the pivoted rod, and a spring tending to force the small piston inward when not acted upon by the pressure in the cylinder, substantially as described.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 3d day of April, A. D. 1890.

NICOLAUS AUGUST OTTO.

\Vitnesses:

PET. LANGEN, \VILH. SPIEOKER. 

